The gas phase reaction 2A → P in which the product, P is formed when two A molecules collide. When the initial pressure of the gas A in the reaction chamber is increased from 0.5 atm to 1.5 atm what do you expect to observe relative to the original set of conditions? In both cases temperature is the same.
The initial rate increase by a factor of 9.
Question: What does it mean when it said "increase by a factor of 9"? Where is 9 comes from?